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This describes a portable device, like a smart card or phone, that connects to a personal area network. Once connected, it automatically logs the user into other devices on that network using a stored digital certificate. This device then acts as a secure intermediary, encrypting outgoing messages and decrypting incoming messages for those other devices.
Why it matters: Filed before secure elements and advanced PAN capabilities became standard in smartphones. A modern phone can now readily serve as the "first device," offering robust cryptographic services and seamless network integration for other devices.
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